Turn on Swift 6 mode (pointfreeco#227)

* Turn on Swift 6 mode

* Update wasm snapshots

* Apply checksum.

---------

Co-authored-by: Brandon Williams <mbrandonw@hey.com>

Author: minhaaan

.github/workflows/ci.yml

@@ -42,8 +42,9 @@ jobs:
     strategy:
       matrix:
         include:
-          - toolchain: swift-DEVELOPMENT-SNAPSHOT-2024-07-08-a
-            swift-sdk: swift-wasm-DEVELOPMENT-SNAPSHOT-2024-07-09-a
+          - toolchain: swift-DEVELOPMENT-SNAPSHOT-2024-09-12-a
+            swift-sdk: swift-wasm-DEVELOPMENT-SNAPSHOT-2024-09-12-a
+            checksum: 630ce23114580dfae029f832d8ccc8b1ba5136b7f915e82f8e405650e326b562
     steps:
       - uses: actions/checkout@v4
       - uses: bytecodealliance/actions/wasmtime/setup@v1
@@ -55,7 +56,7 @@ jobs:
           set -ex
           curl -f -o /tmp/swift.tar.gz "https://download.swift.org/development/ubuntu2204/$SWIFT_TOOLCHAIN_TAG/$SWIFT_TOOLCHAIN_TAG-ubuntu22.04.tar.gz"
           sudo mkdir -p $PREFIX; sudo tar -xzf /tmp/swift.tar.gz -C $PREFIX --strip-component 1
-          $PREFIX/usr/bin/swift experimental-sdk install "https://github.com/swiftwasm/swift/releases/download/$SWIFT_SDK_TAG/$SWIFT_SDK_TAG-wasm32-unknown-wasi.artifactbundle.zip"
+          $PREFIX/usr/bin/swift sdk install "https://github.com/swiftwasm/swift/releases/download/$SWIFT_SDK_TAG/$SWIFT_SDK_TAG-wasm32-unknown-wasi.artifactbundle.zip" --checksum ${{ matrix.checksum }}
           echo "$PREFIX/usr/bin" >> $GITHUB_PATH
       - name: Build tests
         run: swift build --swift-sdk wasm32-unknown-wasi --build-tests -Xlinker -z -Xlinker stack-size=$((1024 * 1024))

Package@swift-6.0.swift

@@ -91,18 +91,7 @@ let package = Package(
         "UIKitNavigation"
       ]
     ),
-  ]
-  //, swiftLanguageModes: [.v6]
+  ],
+  swiftLanguageModes: [.v6]
 )
 
-for target in package.targets {
-  target.swiftSettings = target.swiftSettings ?? []
-  target.swiftSettings!.append(contentsOf: [
-    .enableExperimentalFeature("StrictConcurrency")
-  ])
-  // target.swiftSettings?.append(
-  //   .unsafeFlags([
-  //     "-enable-library-evolution",
-  //   ])
-  // )
-}